I have not, but I know people who have. Their recco to me was to save money. There are better products out there. Biotest is like a premium GNC, same level as Muscletech. They make the "best", and have the "baddest" lifters to endorse it. You pay me enough and I'll tell everyone eating a pile of hot horseshit is good for you pre-WO..

I make this recco to you Coop. If you like 1,3 Dimeth..go with Pre-Surge Unleashed. If you don't like it, go with Animal Rage. I've used both, and am on Rage now. I love the stuff. Focus is insane, energy is perfect with no crash or jitters..